Eccentric worm pump having a rotary slide



1968 M. STREICHER ECCENTRIC WORM PUMP HAVING A ROTARY SLIDE Filed April 5, 1967 Inventor- Shem-her "g W4. .MmH'

United States Patent 3,408,945 ECCENTRIC WORM PUMP HAVING A ROTARY SLIDE Max Streicher, Wangen, Germany, assignor of one-half to Oskar Seidl, Munich, Germany Filed Apr. 3, 1967, Ser. No. 628,097 Claims priority, application Germany, Apr. 4, 1966, S 50 2 Claims. (Cl 103-117) ABSTRACT OF THE DISCLOSURE The present invention relates to an eccentric worm pump having a rotary slide, which serves the reversal of the fed or removed feeding medium.

It is known that in eccentric worm pumps, the direction of feeding can be reversed, so that the chamber space, which is on the suction side in case of normal forward feeding, is passed by the medium fed by pressure, which in most instances, does not lead into the suction conduit, rather into another conduit. For this purpose the suction conduit has been equipped until now with a branch and a cross-over cock which amounts to an additional technical expenditure with corresponding requirement of space.

It is, therefore, one object of the present invention to provide an eccentric worm pump having a rotary slide in which the rotary slide is disposed in the shaft housing of the pump as a hollow cylinder having one or a plurality of control openings and rotatably guided concentrically on the inner wall of the housing.

This arrangement is based on the presumption that in eccentric inner worm pumps the housing disposed on the suction side for feeding the medium and the arrangement of the drive shaft has a cross-section which corresponds also with the cross-sectional area of a coordinated crossover cock and which is exploited in an advantageous manner for the arrangement of a rotary slide as reversal member.

It is another object of the present invention to provide an eccentric worm pump having a rotary slide wherein the rotary slide is disposed in the chamber of the shaft housing containing the link coupling, and with a hand lever radially guided through the housing walls, which is particularly suitable in connection with the insertion and removal, respectively, of the slide.

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawing, in which:

FIGURE 1 is an axial section of the eccentric worm pump designed in accordance with the present invention; and

FIG. 2 is a section along the lines 2-2 of FIG. 1.

Referring now to the drawing, the shaft housing 1, which follows the bearing housing 2., is closed by a flanged cover 3 towards the outside. One of the two link couplings 6 is secured to the shaft 5 and an intermediate shaft 7 leads to the other link coupling.

The housing 1 is arranged in this range with a hollowedout portion, in which a rotary slide 8 is rotatably mounted, however, axially immovable. The passage opening 9 of the slide 8 is aligned in the end positions I and II, respectively, with the branches 10 and 11, respectively. For its operation, the slide 8 is equipped with a handle member 12, which is guided through the housing wall in recess 13 and fixedly arranged in the set position by conventional means.

While I have disclosed one embodiment of the present invention it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. An eccentric worm pump with a rotary slide for reversal of the feeding medium comprising a shaft housing,

a drive shaft rotatably mounted in said shaft housing,

a cover disposed in a plane perpendicular to said drive shaft and closing in axial direction said shaft housing, and

a rotary slide comprising a hollow cylinder member having at least one control opening and guided concentrically on the inner wall of said shaft housing.

2. The eccentric worm pump, as set forth in claim 1, which includes a link-coupling disposed in the portion of said shaft housing receiving said rotary slide and operatively connected with said drive shaft, and

said rotary slide includes a radial lever guided through the wall of said shaft housing.

References Cited UNITED STATES PATENTS 2,028,407 1/1936 Moineau l031 17 2,596,074 5/1952 Hawes 1031 17 2,826,151 3/1958 McCray l03-117 2,924,180 2/ 1960 Bourke et a1. 1031l7 3,098,449 7/1963 Hill 103-117 FRED C. MATTERN, IR., Primary Examiner.

WILBUR I. GOODLIN, Assistant Examiner.

Patented Nov. 5, 1968 

